netdev - Re: [PATCH net-next 5/8] net/mlx5e: Expose the VF/SF RX drop counter on the representor

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Date: Thu, 28 Mar 2024 11:18:31 +0000
From: Simon Horman <horms@...nel.org>
To: Tariq Toukan <tariqt@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
	Saeed Mahameed <saeedm@...dia.com>, Gal Pressman <gal@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Carolina Jubran <cjubran@...dia.com>, Aya Levin <ayal@...dia.com>
Subject: Re: [PATCH net-next 5/8] net/mlx5e: Expose the VF/SF RX drop counter
 on the representor

On Wed, Mar 27, 2024 at 12:20:19AM +0200, Tariq Toukan wrote:
> From: Carolina Jubran <cjubran@...dia.com>
> 
> Q counters are device-level counters that track specific
> events, among which are out_of_buffer events. These events
> occur when packets are dropped due to a lack of receive
> buffer in the RX queue.
> 
> Expose the total number of out_of_buffer events on the
> VF/SF to their respective representor, using the
> "ethtool -S" under the name of "rx_vport_out_of_buffer".
> 
> The "rx_vport_out_of_buffer" equals the sum of all
> Q counters out_of_buffer values allocated on the VF/SF.

Hi Carolina and Tariq,

I am wondering if any consideration was given to making this
a generic counter. Buffer exhaustion sounds like something that
other NICs may report too.

> 
> Signed-off-by: Carolina Jubran <cjubran@...dia.com>
> Reviewed-by: Gal Pressman <gal@...dia.com>
> Reviewed-by: Aya Levin <ayal@...dia.com>
> Signed-off-by: Tariq Toukan <tariqt@...dia.com>

...